Wow, they are gone within a couple minutes!  Moderators or admin are on the ball! 

Thanks guys 

Been using it for years and it is BP compatible.

For some applications there are much better options.

Straight Ballistol doesn't work well removing hard BP fouling. You need to mix it with water. AKA Moose Milk (1 or 2 parts Ballistol to 9 or 8 parts water)

For cleaning hard BP deposits I find PAM works better than Ballistol and Dawn Power Wash works better still.

When my H&R did the same thing, it wasn't that the cam had turned on the shaft, but that the weld on the thumb piece had broken and the thumb piece had turned on the shaft which didn't allow the shaft to turn far enough to fully engage the cam.  You might check that

  Tayhitman 

The 1866 receiver is BRASS.  It will stain whether shooting Smokeless or Black Powder or Subs.  I am also surprised Brasso didn't do the job. 

There are those of us who champion Brass rifles who actually prefer to allow the brass rifles to stain (patina??) and like the look.  All of my Brass rifles are well patina'd and I prefer that look.  It is however your rifle and it's your choice.

DO NOT USE SANDPAPER unless you use 2000 or 3000 grit wet/dry.  Any larger grit will actually leave scratches you may not be able to remove.